Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Sunday & Monday
A 1000 mb surface low is currently located just west of Gray's Harbor's as of 1 pm and is forecast to track NE across the Olympic peninsula early this evening. While the heaviest precipitation totals are likely in the south Washington Cascades, the snow level has crept up to 5500-6000 ft in this area. A cold front passing through south/central Cascades and Mt. Hood this afternoon will end the steady precipitation and S-SE flow that has helped drive hefty hourly precipitation totals near Crystal Mt and Chinook Pass.
The Cascade Passes are seeing an influx of cool easterly flow... which will locally maintain the snow levels around 4000 ft until warmer air pushes in late this afternoon. The biggest snow benefactor from this system should be the Olympics and north Cascades... where snow levels should stay below 4500 ft most of the day with a healthy dose of snowfall today through early Sunday night.
The low pressure system will lift NE and across the Cascades tonight... with light to moderate showers tapering down across the area through Monday morning. Weak upper level ridging should build over the area Monday afternoon, but leftover moisture and a few isolated showers should only allow for partial clearing.
Weather Forecast
Olympics, north Washington Cascades
| Sunday Afternoon - Sunday Evening |
Moderate to occasionally heavy rain and snow. |
| Sunday Night - Monday Morning |
Light to moderate rain and snow showers diminishing overnight with partial clearing. Slight cooling trend. |
| Monday Afternoon - Monday Night |
Partly cloudy. |
South and central Washington Cascades including Stevens, Snoqualmie, and White Passes
| Sunday Afternoon - Sunday Evening |
Moderate to occasionally heavy rain and snow becoming light to moderate rain and snow showers Sunday afternoon. Windy. |
| Sunday Night - Monday Morning |
Light to moderate rain and snow showers diminishing overnight with partial clearing. Slight cooling trend. |
| Monday Afternoon - Monday Night |
Partly cloudy. |
Mt. Hood Area
| Sunday Afternoon |
Cloudy with periods of light rain and snow. Mild. |
| Sunday Night - Monday Morning |
Light to moderate rain and snow showers diminishing overnight with partial clearing. Slight cooling trend. |
| Monday Afternoon - Monday Night |
Partly cloudy. |
Issued: 1:50 PM PDT Sunday, March 15, 2015
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Sunday Mid-day | Snow Level * | 3500' | 4000' | 4500' | ' | ' | 6000' | ' | 7000' |
| Sunday Afternoon | Snow Level * | 4000' | 5000' | 5000' | ' | ' | 7000' | ' | 6500' |
| Sunday Night - Monday Morning | Snow Level | 3500' | 3500' | 3500' | ' | ' | 3500' | ' | 4500' |
| Monday Afternoon - Monday Night | Snow Level | 5000' | 5000' | 5000' | ' | ' | 6000' | ' | 7500' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Mid-day |
Snow Level 3500' (Easterly Flow *) |
| Sunday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 3500' |
| Monday Afternoon - Monday Night |
Snow Level 5000' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Mid-day |
Snow Level 4000' (Easterly Flow *) |
| Sunday Afternoon |
Snow Level 5000' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 3500' |
| Monday Afternoon - Monday Night |
Snow Level 5000' |
| Washington Pass | Elevation |
|---|---|
| Sunday Mid-day |
Snow Level 4500' (Easterly Flow *) |
| Sunday Afternoon |
Snow Level 5000' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 3500' |
| Monday Afternoon - Monday Night |
Snow Level 5000' |
| Leavenworth | Elevation |
|---|---|
| Sunday Mid-day |
Snow Level ' (Easterly Flow *) |
| Sunday Afternoon |
Snow Level ' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level ' |
| Monday Afternoon - Monday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Sunday Mid-day |
Snow Level ' (Easterly Flow *) |
| Sunday Afternoon |
Snow Level ' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level ' |
| Monday Afternoon - Monday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Mid-day |
Snow Level 6000' (Easterly Flow *) |
| Sunday Afternoon |
Snow Level 7000' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 3500' |
| Monday Afternoon - Monday Night |
Snow Level 6000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Mid-day |
Snow Level ' (Easterly Flow *) |
| Sunday Afternoon |
Snow Level ' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level ' |
| Monday Afternoon - Monday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Mid-day |
Snow Level 7000' (Easterly Flow *) |
| Sunday Afternoon |
Snow Level 6500' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 4500' |
| Monday Afternoon - Monday Night |
Snow Level 7500' |
* Easterly flow in the Cascade Passes can cause locally lower Snow or Freezing levels than areas further west.
Freezing Level is when no precipitation is forecast.
Precipitation Forecast
| Monday | Monday | |
|---|---|---|
| Hurricane Ridge | 1.50 - 2.00 | LT 0.10 |
| Mt Baker Ski Area | 1.50 - 2.00 | LT 0.10 |
| Washington Pass | 1.00 - 2.00 | LT 0.10 |
| Stevens Pass | 1.00 - 1.50 | LT 0.10 |
| Snoqualmie Pass | 1.50 - 2.00 | LT 0.10 |
| Mission Ridge | 1.00 - 1.50 | LT 0.10 |
| Crystal Mt | 0 - 2.00 | LT 0.10 |
| Paradise | 0 - 3.00 | LT 0.10 |
| White Pass | 0 - 1.50 | LT 0.10 |
| Mt Hood Meadows | 0.50 - 0.75 | LT 0.10 |
| Timberline | 0 - 1.00 | LT 0.10 |
LT = less than; WE or Water equivalent is the liquid water equivalent of melted snow in hundredths of inches. As a rough approximation 1 inch of snow = about .10 inches WE, or 10 inches of snow = about 1 inch WE.
Issued: 1:50 PM PDT Sunday, March 15, 2015
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Afternoon | NE 10 - 20 | SE 5 - 15 | SSW 20 - 30 | --- - | SW 35 - 50 |
| Sunday Night | N 5 - 15 | NE 10 - 20 | WSW 15 - 30 | --- - | W 15 - 30 |
| Monday | E 0 - 10 | E 0 - 10 | E 5 - 15 | --- - | E 5 - 15 |
| Monday Night | S 5 - 15 | SE 0 - 10 | SE 5 - 15 | --- - | SE 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon | NE 10 - 20 |
| Sunday Night | N 5 - 15 |
| Monday | E 0 - 10 |
| Monday Night | S 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon | SE 5 - 15 |
| Sunday Night | NE 10 - 20 |
| Monday | E 0 - 10 |
| Monday Night | SE 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon | SSW 20 - 30 |
| Sunday Night | WSW 15 - 30 |
| Monday | E 5 - 15 |
| Monday Night | SE 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday | --- - |
| Monday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon | SW 35 - 50 |
| Sunday Night | W 15 - 30 |
| Monday | E 5 - 15 |
| Monday Night | SE 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Afternoon | NE 10 - 20 |
| Sunday Night | N 5 - 15 |
| Monday | E 0 - 10 |
| Monday Night | S 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | SE 5 - 15 |
| Sunday Night | NE 10 - 20 |
| Monday | E 0 - 10 |
| Monday Night | SE 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | SSW 20 - 30 |
| Sunday Night | WSW 15 - 30 |
| Monday | E 5 - 15 |
| Monday Night | SE 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | SW 35 - 50 |
| Sunday Night | W 15 - 30 |
| Monday | E 5 - 15 |
| Monday Night | SE 5 - 15 |
Directions above indicate the direction the wind blows from on the 16-point cardinal scale. These winds indicate "free" winds, or those winds in the atmosphere not influenced by terrain. Topographical effects may produce greater or lower wind speeds in certain locations as well as significant variations in direction.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Afternoon | SSW 30 - 40 | SSW 20 - 30 | SW 60 - 70 | --- - | SW 60 - 70 |
| Sunday Night | VAR 5 - 15 | W 5 - 15 | W 35 - 50 | --- - | W 35 - 50 |
| Monday Morning | NW 5 - 15 | NW 10 - 20 | NW 15 - 25 | --- - | W 15 - 25 |
| Monday Afternoon - Monday Night | SW 5 - 15 | WSW 5 - 15 | SW 5 - 15 | --- - | SW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | SSW 30 - 40 |
| Sunday Night | VAR 5 - 15 |
| Monday Morning | NW 5 - 15 |
| Monday Afternoon - Monday Night | SW 5 - 15 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | SSW 20 - 30 |
| Sunday Night | W 5 - 15 |
| Monday Morning | NW 10 - 20 |
| Monday Afternoon - Monday Night | WSW 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | SW 60 - 70 |
| Sunday Night | W 35 - 50 |
| Monday Morning | NW 15 - 25 |
| Monday Afternoon - Monday Night | SW 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon - Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | SW 60 - 70 |
| Sunday Night | W 35 - 50 |
| Monday Morning | W 15 - 25 |
| Monday Afternoon - Monday Night | SW 10 - 20 |
Directions above indicate the direction the wind blows from on the 16-point cardinal scale. These winds indicate "free" winds, or those winds in the atmosphere not influenced by terrain. Topographical effects may produce greater or lower wind speeds in certain locations as well as significant variations in direction.
Issued: 1:50 PM PDT Sunday, March 15, 2015
Extended Weather Synopsis for Monday night through Monday
A weak Pacific frontal system will approach Monday night and push over the Cascades Tuesday. This front should produce only light amounts of precipitation at moderate snow levels... with very light amounts likely for the Mt. Hood area. Weak ridging will try to rebuild Tuesday night and give us a dry day on Wednesday... but another weak system should be approaching from the west during the afternoon.
The ridge should quickly shift east Wednesday night with light rain and snow from a frontal boundary hanging up mostly over the Olympics and north Cascades on Thursday.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Occasional light rain and snow.
Partly to mostly cloudy.
Increasing clouds Wednesday night with light rain and snow developing Thursday, especially Olympics and north Cascades.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday - Wednesday Morning | Snow Level | 4500' - 5500' | 5000' - 6000' | 5500' - 6500' | |
| Wednesday Afternoon - Wednesday Night | Freezing Level | 5000' - 6000' | 5500' - 6500' | 7000' - 8000' | |
| Thursday | Snow Level | 4500' - 5500' | 5500' - 6500' | 6000' - 7000' |
| Mt. Baker | Elevation |
|---|---|
| Tuesday - Wednesday Morning |
Snow Level 4500' - 5500' |
| Wednesday Afternoon - Wednesday Night |
Freezing Level 5000' - 6000' |
| Thursday |
Snow Level 4500' - 5500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday - Wednesday Morning |
Snow Level 5000' - 6000' |
| Wednesday Afternoon - Wednesday Night |
Freezing Level 5500' - 6500' |
| Thursday |
Snow Level 5500' - 6500' |
| Mt. Hood | Elevation |
|---|---|
| Tuesday - Wednesday Morning |
Snow Level 5500' - 6500' |
| Wednesday Afternoon - Wednesday Night |
Freezing Level 7000' - 8000' |
| Thursday |
Snow Level 6000' - 7000' |
* Easterly flow in the Cascade Passes can cause locally lower Snow or Freezing levels than areas further west.
Freezing Level is when no precipitation is forecast.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Previous forecast from Mar 15, 2015
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